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A068739 as a simple table

na(n)
11
22
35
413
531
672
7156
8337
9701
101452
112964
126001
1312108
1424324
1548871
1697988
17196224
18392768
19785946
201572353
213145554
226291980

[1,2,5,13,31,72,156,337,701,1452,2964,6001,12108,
 24324,48871,97988,196224,392768,785946,1572353,
 3145554,6291980]